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Operational sex ratioAdvanced Search Abstract The operational sex ratio ratio of sexually receptive males to females has been extensively studied in behavioral ecology, whereas other demographic factors such as the effect of density on mating behavior have received less empirical attention. We manipulated mating competition by establishing breeding populations of the sex-role reversed broad-nosed pipefish Syngnathus typhle at 2 sex ratios male biased or female biased and 2 densities. Association between the sexes X was higher under male bias than female bias, probably because males were still available for mating under male bias. In addition, X decreased in the female-biased treatment as the operational sex ratio became even more female biased. Therefore, we recommend caution with their broadscale application. Although we have made progress in understanding the causes and consequences of sexual selection, there are still many aspects that are not well understood.Manipulation of the operational sex ratio (OSR) in guppies, Poecilia reticulata, causes changes in male–male competition and female mate choice. In this study . This chapter reviews the theoretical foundations for this phenomenon, focusing on the concept of operational sex ratio (OSR; the ratio of viable and available. Am Nat. Feb;(2) doi: / The influence of operational sex ratio on the intensity of competition for mates. Weir LK(1), Grant JW...the end of the story look at the video above ↑ ↑ ↑

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